Yosemite National Park, California
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | San Luis Obispo County Mountains |
| Effective: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Onset: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 11:59 am |
| Headline: | Red Flag Warning issued August 28 at 9:59AM PDT until August 28 at 3:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY/ERRATIC WINDS AND LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT THROUGH 3 PM TODAY ACROSS ALL OF SAN LUIS OBISPO COUNTY TO DO POTENTIAL FOR DRY LIGHTNING... .A hot and unstable air mass combined with locally gusty/erratic winds and low humidities will bring continue to bring a risk of large plume dominated fires with rapid spread and extreme fire behavior. Additionally, tropical moisture streaming across our area will bring a 10-25 percent chance of thunderstorms to the region, with a moderate risk for fire starts across San Luis Obispo County due to dry lightning potential. * THUNDERSTORMS...Moderate risk for dry lightning with minimal rain as well as gusty and erratic winds. * TEMPERATURES...Highs 90 to 100. Deep mixing heights of 10,000 to 15,000 feet today. * IMPACTS...Moderate risk for fire starts associated with dry lightning. Additionally, there is a continued risk of large plume dominated fires with rapid fire spread and extreme fire behavior. |
| Alert: | Red Flag Warning |
| Area(s): | Santa Susana Mountains; Eastern San Gabriel Mountains |
| Effective: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Onset: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 11:59 am |
| Headline: | Red Flag Warning issued August 28 at 9:59AM PDT until August 28 at 3:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY/ERRATIC WINDS AND LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT THROUGH 3 PM TODAY ACROSS ALL OF SAN LUIS OBISPO COUNTY TO DO POTENTIAL FOR DRY LIGHTNING... .A hot and unstable air mass combined with locally gusty/erratic winds and low humidities will bring continue to bring a risk of large plume dominated fires with rapid spread and extreme fire behavior. Additionally, tropical moisture streaming across our area will bring a 10-25 percent chance of thunderstorms to the region, with a moderate risk for fire starts across San Luis Obispo County due to dry lightning potential. * TEMPERATURES...Highs 96 to 106 across the lower elevations. Highs 85 to 95 common across the higher mountains. Lows in the mid 70s to mid 80s common in the mountains and foothills. Very deep mixing heights of 12,000 to 18,000 feet today. * WINDS...Southwest 10 to 20 mph with gusts 20 to 30 mph this afternoon into early evening. In addition, strong/erratic wind gusts will be likely near any passing thunderstorms or showers. * RELATIVE HUMIDITY...Minimum humidities 12 to 25 percent. Poor recoveries overnight hours in the mountains and foothills with humidities in the 15 to 30 percent range. * IMPACTS...There is a continued risk of large plume dominated fires with rapid fire spread and extreme fire behavior. There is a history of large plume dominated fires this time of year with similar weather and fuel conditions, including the Bridge, Bobcat, and Station fires. |
| Alert: | Red Flag Warning |
| Area(s): | Cuyama Valley; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor |
| Effective: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Onset: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 11:59 am |
| Headline: | Red Flag Warning issued August 28 at 9:59AM PDT until August 28 at 3:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY/ERRATIC WINDS AND LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT THROUGH 3 PM TODAY ACROSS ALL OF SAN LUIS OBISPO COUNTY TO DO POTENTIAL FOR DRY LIGHTNING... .A hot and unstable air mass combined with locally gusty/erratic winds and low humidities will bring continue to bring a risk of large plume dominated fires with rapid spread and extreme fire behavior. Additionally, tropical moisture streaming across our area will bring a 10-25 percent chance of thunderstorms to the region, with a moderate risk for fire starts across San Luis Obispo County due to dry lightning potential. * TEMPERATURES...Highs 98 to 105 across the lower mountains, adjacent foothills and the Cuyama Valley, and 85 to 95 across higher mountains. Very deep mixing heights of 12,000 to 18,000 feet today. * WINDS...Local north winds 15 to 25 mph with gusts up to 35 mph across the interior mountains today, along with strong/erratic wind gusts near any passing thunderstorms or showers. * RELATIVE HUMIDITY...Minimum humidities 12 to 25 percent. Poor recoveries overnight hours in the mountains and foothills with humidities in the 20 to 30 percent range. * IMPACTS...There is a continued risk of large plume dominated fires with rapid fire spread and extreme fire behavior. There is a history of large plume dominated fires this time of year with similar weather and fuel conditions, including the Bridge, Bobcat, and Station fires. |
| Alert: | Red Flag Warning |
| Area(s): | San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys |
| Effective: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Onset: | 2026-08-28 @ 11:59 am -> 2026-08-28 @ 5:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 11:59 am |
| Headline: | Red Flag Warning issued August 28 at 9:59AM PDT until August 28 at 3:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND INSTABILITY ALONG WITH LOCALLY GUSTY/ERRATIC WINDS AND LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT THROUGH 3 PM TODAY ACROSS ALL OF SAN LUIS OBISPO COUNTY TO DO POTENTIAL FOR DRY LIGHTNING... .A hot and unstable air mass combined with locally gusty/erratic winds and low humidities will bring continue to bring a risk of large plume dominated fires with rapid spread and extreme fire behavior. Additionally, tropical moisture streaming across our area will bring a 10-25 percent chance of thunderstorms to the region, with a moderate risk for fire starts across San Luis Obispo County due to dry lightning potential. * THUNDERSTORMS...Moderate risk for dry lightning with minimal rain as well as gusty and erratic winds. * TEMPERATURES...Highs 90 to 100 across the lower mountains,valleys,and adjacent foothills, and 80 to 90 closer to the coast. Deep mixing heights of 10,000 to 15,000 feet today. * IMPACTS...Moderate risk for fire starts associated with dry lightning. Additionally, there is a continued risk of large plume dominated fires across the interior with rapid fire spread and extreme fire behavior. |
| Alert: | Red Flag Warning |
| Area(s): | Santa Cruz Mountains; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast |
| Effective: | 2026-08-28 @ 8:51 am -> 2026-08-28 @ 5:00 pm |
| Onset: | 2026-08-28 @ 8:51 am -> 2026-08-28 @ 5:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Francisco CA on 2026-08-28 @ 8:51 am |
| Headline: | Red Flag Warning issued August 28 at 6:51AM PDT until August 28 at 3:00PM PDT by NWS San Francisco CA |
| Description: |
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 3 PM PDT THIS AFTERNOON DUE TO LIGHTNING FOR SANTA CRUZ MOUNTAINS, SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO, SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST, NORTHERN SALINAS VALLEY/HOLLISTER VALLEY AND CARMEL VALLEY, NORTHERN MONTEREY BAY, AND SOUTHERN MONTEREY BAY AND BIG SUR COAST... ....The potential for isolated thunderstorms across the Central Coast continues from this morning through Friday afternoon... * AFFECTED AREA...The Salinas and Carmel Valleys and Hollister Area, Monterey Bay and the Big Sur Coast, The Santa Cruz Mountains, and Interior Monterey County and the Santa Lucia Range. * TIMING...Until 3 PM PDT this afternoon. * THUNDERSTORMS...Lightning strikes with little precipitation and gusty and erratic outflow winds of 40 to 50 mph. * IMPACTS...There will be an increased risk for power outages. Lightning strikes may result in new fire ignitions. Erratic outflow winds will result in rapid fire spread for both new and existing fires. |
| Alert: | Heat Advisory |
| Area(s): | Riverside County Mountains |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Heat Advisory issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Temperatures of 85 to 99. * WHERE...Riverside County Mountains. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Low temperatures 10 to 15 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Heat Advisory |
| Area(s): | Orange County Coastal |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Heat Advisory issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Temperatures of 85 to 92. * WHERE...Orange County Coastal Areas. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. |
| Alert: | Heat Advisory |
| Area(s): | San Bernardino County Mountains |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Heat Advisory issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Temperatures of 85 to 95. * WHERE...San Bernardino County Mountains below 6000 feet. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Low temperatures 10 to 15 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Extreme Heat Warning |
| Area(s): | Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 115. * WHERE...Coachella Valley, San Diego County Deserts, and San Gorgonio Pass near Banning. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Overnight temperatures 5 to 10 degrees above normal will limit relief from the heat. |
| Alert: | Extreme Heat Warning |
| Area(s): | San Diego County Mountains |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 90 to 100. * WHERE...San Diego County Mountains. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 10 to 15 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Heat Advisory |
| Area(s): | San Diego County Coastal Areas |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Heat Advisory issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Temperatures of 85 to 93. * WHERE...San Diego County Coastal Areas. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses. |
| Alert: | Extreme Heat Warning |
| Area(s): | Apple and Lucerne Valleys |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 95 to 105. * WHERE...Apple and Lucerne Valleys. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Extreme Heat Warning |
| Area(s): | Santa Ana Mountains and Foothills |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 100. * WHERE...Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Extreme Heat Warning |
| Area(s): | San Bernardino and Riverside County Valleys-The Inland Empire |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 103 to 107. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness across populations. |
| Alert: | Extreme Heat Warning |
| Area(s): | San Diego County Inland Valleys |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 95 to 104. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Extreme Heat Warning |
| Area(s): | Orange County Inland |
| Effective: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 4:15 pm |
| Onset: | 2026-08-28 @ 7:03 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Diego CA on 2026-08-28 @ 7:03 am |
| Headline: | Extreme Heat Warning issued August 28 at 5:03AM PDT until August 28 at 8:00PM PDT by NWS San Diego CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 95 to 100. * WHERE...Orange County Inland Areas. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. |
| Alert: | Extreme Heat Warning |
| Area(s): | Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Hualapai Mountains; Northwest Deserts; Death Valley National Park; Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Southern Clark County; Lake Mead - NV side; Lake Mohave - NV side |
| Effective: | 2026-08-28 @ 6:22 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 6:22 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Las Vegas NV on 2026-08-28 @ 6:22 am |
| Headline: | Extreme Heat Warning issued August 28 at 4:22AM PDT until August 28 at 8:00PM PDT by NWS Las Vegas NV |
| Description: |
* WHAT...Dangerously hot conditions expected through today, with temperatures up to 115 to 118 across Death Valley and the Colorado River Valley; up to 108 to 112 across Moapa Valley, the Las Vegas Valley, the Pahrump Valley, and the Morongo Valley; up to 90 to 95 in the Hualapai Mountains. Overnight lows will be in the upper-80s to low-90s for desert valleys. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...Until 8 PM PDT /8 PM MST/ this evening. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley |
| Effective: | 2026-08-28 @ 2:22 am -> 2026-08-28 @ 5:30 pm |
| Onset: | 2026-08-28 @ 2:22 am -> 2026-08-29 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Phoenix AZ on 2026-08-28 @ 2:22 am |
| Headline: | Extreme Heat Warning issued August 28 at 12:22AM MST until August 29 at 8:00PM MST by NWS Phoenix AZ |
| Description: |
* WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 116. Major Heat Risk. * WHERE...Portions of southwest Arizona and southeast California. * WHEN...Until 8 PM MST /8 PM PDT/ Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. |
| Alert: | Extreme Heat Warning |
| Area(s): | Joshua Tree NP East; Salton Sea; Chuckwalla Mountains; Chiriaco Summit |
| Effective: | 2026-08-28 @ 2:22 am -> 2026-08-28 @ 5:30 pm |
| Onset: | 2026-08-28 @ 2:22 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Phoenix AZ on 2026-08-28 @ 2:22 am |
| Headline: | Extreme Heat Warning issued August 28 at 12:22AM MST until August 28 at 8:00PM MST by NWS Phoenix AZ |
| Description: |
* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to 113. Major Heat Risk. * WHERE...Chuckwalla Mountains, Salton Sea, Chiriaco Summit, and Joshua Tree NP East. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. |
| Alert: | Extreme Heat Warning |
| Area(s): | Catalina and Santa Barbara Islands; Santa Barbara County Southeastern Coast; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Extreme Heat Warning issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Hot daytime conditions with high temperatures between 92 and 102 common. Warm overnight conditions will bring less relief than usual. * WHERE...Most coastal areas of Los Angeles, Ventura, and southern Santa Barbara Counties. * WHEN...Until 8 PM PDT Friday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors. |
| Alert: | Heat Advisory |
| Area(s): | Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Heat Advisory issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Hot daytime conditions with high temperatures between 95 and 105 common. * WHERE...San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Lucia Mountains, and Southern Salinas Valley. * WHEN...Until 8 PM PDT Friday. * IMPACTS...There is a high risk for dangerous heat illness for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors. |
| Alert: | Heat Advisory |
| Area(s): | San Luis Obispo County Inland Central Coast; Santa Barbara County Inland Central Coast; Santa Ynez Valley |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Heat Advisory issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Hot daytime conditions with high temperatures between 90 and 100 common. * WHERE...San Luis Obispo County Inland Central Coast, Santa Barbara County Inland Central Coast, and Santa Ynez Valley. * WHEN...Until 8 PM PDT Friday. * IMPACTS...There is a high risk for dangerous heat illness for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors. * ADDITIONAL DETAILS...This advisory has been extended to now end on Friday. While temperatures will peak through Thursday, humidities will rise on Friday largely mitigating any relief from the heat. |
| Alert: | Extreme Heat Warning |
| Area(s): | Cuyama Valley; Santa Clarita Valley; Santa Barbara County Interior Mountains; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley; Los Angeles County San Gabriel Valley |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Extreme Heat Warning issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Hot daytime conditions with high temperatures between 100 and 110 common. Warm overnight conditions will bring less relief than usual. * WHERE...Most mountains and valleys of Los Angeles, Ventura, and Santa Barbara Counties. * WHEN...Until 8 PM PDT Friday. * IMPACTS...There is a high risk for dangerous heat illness, especially for sensitive groups like the very young, the very old, those without air conditioning, and those active outdoors. |
| Alert: | Extreme Heat Warning |
| Area(s): | Santa Barbara County Southwestern Coast |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Extreme Heat Warning issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 93. * WHERE...Santa Barbara County Southwestern Coast. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range |
| Effective: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-28 @ 12:30 am -> 2026-08-28 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-28 @ 12:30 am |
| Headline: | Extreme Heat Warning issued August 27 at 10:30PM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 96. * WHERE...Santa Ynez Mountains Eastern Range and Santa Ynez Mountains Western Range. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. |
| Alert: | Air Quality Alert |
| Area(s): | Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor |
| Effective: | 2026-08-25 @ 9:55 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-25 @ 9:55 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-25 @ 9:55 am |
| Headline: | Air Quality Alert issued August 25 at 7:55AM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in the the South Coast Air Basin and Coachella Valley. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport. * WHEN...from 1 PM Monday to 8 PM Friday. The highest ozone levels typically occur in the afternoon and early-evening hours. * IMPACTS... Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor |
| Effective: | 2026-08-25 @ 8:39 am -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-25 @ 8:39 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-08-25 @ 8:39 am |
| Headline: | Air Quality Alert issued August 25 at 6:39AM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in the the South Coast Air Basin and Coachella Valley. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport. * WHEN...from 1 PM Monday to 8 PM Friday. The highest ozone levels typically occur in the afternoon and early-evening hours. * IMPACTS... Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | San Bernardino and Riverside County Valleys-The Inland Empire; San Bernardino County Mountains; Coachella Valley; San Gorgonio Pass Near Banning; Orange County Inland |
| Effective: | 2026-08-24 @ 3:34 pm -> 2026-08-28 @ 10:00 pm |
| Onset: | 2026-08-24 @ 3:34 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-08-24 @ 3:34 pm |
| Headline: | Air Quality Alert issued August 24 at 1:34PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in the the South Coast Air Basin and Coachella Valley. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport. * WHEN...from 1 PM Monday to 8 PM Friday. The highest ozone levels typically occur in the afternoon and early-evening hours. * IMPACTS... Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |